Hi, when I activate the plugin I get an error via CF7.

AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to undefined method mailazyWPClient::getCustomHeaders() in /var/www/vhosts/sitename.com/httpdocs/wp-content/plugins/contact-form-7/includes/mail.php:290\nStack trace:\n#0 /var/www/vhosts/sitename.com/httpdocs/wp-includes/class-wp-hook.php(307): wpcf7_phpmailer_init()\n#1 /var/www/vhosts/sitename.com/httpdocs/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters()\n#2 /var/www/vhosts/sitename.com/httpdocs/wp-includes/plugin.php(522): WP_Hook->do_action()\n#3 /var/www/vhosts/sitename.com/httpdocs/wp-content/plugins/mailazy/mailazy.php(329): do_action_ref_array()\n#4 /var/www/vhosts/sitename.com/httpdocs/wp-content/plugins/contact-form-7/includes/mail.php(194): wp_mail()\n#5 /var/www/vhosts/sitename.com/httpdocs/wp-content/plugins/contact-form-7/includes/mail.php(19): WPCF7_Mail->compose()\n#6 /var/www/vhosts/sitename.com/httpdocs/wp-content/plugins/contact-form-7/includes/submission.php(635): WPCF7_Mail::send()\n#7 /var/www/vhosts/sitename.com/httpdoc...', referer: https://sitename.com/?page_id=8923&preview=true

would anyone be able to support me?
Thanks in advance